Myocarditis and pericarditis refer, respectively, to inflammation of the heart muscle or the pericardium, the sac surrounding the heart. Myocarditis and pericarditis can occur after a viral infection, including COVID-19, as a result of an exaggerated immune response.
Myocarditis and pericarditis can also occur after a vaccination, likely related to the immune response generated by the vaccine.
The Centers for Disease Control and Prevention (CDC) has released data showing a small increase in cases of myocarditis and pericarditis after receiving the mRNA COVID-19 vaccination especially in young adults. In the great majority of cases, though, the myocarditis and pericarditis were mild and resolved on their own.
Risk of these complications is very low. However, if you experience chest pain or discomfort, shortness of breath, nausea or vomiting in the days following your COVID-19 vaccination, it would be prudent to seek medical attention to exclude these or other rare complications of the COVID-19 vaccine
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